diff --git a/libkwineffects/kwinglcolorcorrection.h b/libkwineffects/kwinglcolorcorrection.h
index c2b299745a..ee2497f21d 100644
--- a/libkwineffects/kwinglcolorcorrection.h
+++ b/libkwineffects/kwinglcolorcorrection.h
@@ -133,7 +133,7 @@ private:
     virtual ~ColorCorrection();
 
 private:
-    ColorCorrectionPrivate *d_ptr;
+    ColorCorrectionPrivate * const d_ptr;
     Q_DECLARE_PRIVATE(ColorCorrection)
     static ColorCorrection *s_colorCorrection;
 };